5

KA

NT

HA

LA

PM

KA

NT

HA

LA

-1

KA

NT

HA

LA

F

KA

NT

HA

LD N

IKR

OT

HA

L80 N

IKR

OT

HA

L70 N

IKR

OT

HA

L60 N

IKR

OT

HA

L40

Physical and Mechanical PropertiesKANTHAL and NIKROTHAL alloys are generally available in wire or strip form. Physical and mecha-nical properties of the alloys are listed in Table 2.

Table 2. KANTHAL and NIKROTHAL, Wire and Strip.

Max continuousoperating temp., °C 1425 1400 1300 1300 1200 1250 1150 1100operating temp., °F 2600 2550 2370 2370 2190 2280 2100 2010Nominal composition, % Cr 22 22 22 22 20 30 15 20Nominal composition, % Al 5.8 5.8 5.3 4.8 – – – –Nominal composition, % Fe Rest Rest Rest RestNominal composition, % Ni – – – – 80 70 60 35Resistivity at 20°C, Ωmm-2m-1 1.45 1.45 1.39 1.35 1.09 1.18 1.11 1.04Resistivity at 68°F, Ω/cmf 872 872 836 812 655 704 668 626Density, g/cm3 7.10 7.10 7.15 7.25 8.3 8.1 8.2 7.9Ib/in3 0.256 0.256 0.259 0.262 0.300 0.296 0.296 0.285Coefficient of thermalexpansion, K-1

20-750°C, 68–1380°F 14.10-6 14.10-6 14.10-6 14.10-6 17.10-6 16.10-6 16.10-6 18.10-6

20-1000°C, 68–1838°F 15.10-6 15.10-6 15.10-6 15.10-6 18.10-6 17.10-6 17.10-6 19.10-6

Thermal conductivity at 20°CW m-1 K-1 13 13 13 13 15 13 13 13

68°F, Btu in ft–2 h–1 °F–1 90 90 90 90 104 90 90 90Specific heat capacityKJ kg-1 K-1, 20°C 0.46 0.46 0.46 0.46 0.46 0.46 0.46 0.50

Btu Ib–1 °F–1, 68°F 0.110 0.110 0.110 0.110 0.110 0.110 0.110 0.119Melting point, °C 1500 1500 1500 1500 1400 1380 1390 1390Melting point, °F 2730 2730 2730 2730 2550 2515 2535 2535Mechanical properties (approx.)*Tensile strength, N mm-2 680 680 680 680 750 875 750 750Tensile strength, psi 99000 99000 99000 99000 109000 127000 109000 109000Yield point, N mm-2 445 445 445 445 450 450 450 450Yield point, psi 65000 65000 65000 65000 65000 65000 65000 65000Hardness, Hv 230 230 230 230 180 185 180 180Elongation at rupture, % 19 19 19 19 30 30 30 30Tensile strength at 900°C, Nmm-2 40 34 37 34 100 120 100 120Tensile strength at 1650°F, psi 5800 5000 5400 5000 14500 17400 14500 17400Creep strength at 800°C, N mm-2 14 6 8 6 15 15 15 20Creep strength at 1000°C, N mm-2 1.8 1 1.5 1 4 4 4 4Creep strength at 1470°F, psi 2000 870 1160 870 2160 2160 2160 2160Creep strength at 1830°F, psi 260 145 215 145 580 580 580 580Magnetic properties Magnetic (Curie point 600°C 1100°F)Non Non Slightly NonEmissivity, fully oxidized condition 0.70 0.70 0.70 0.70 0.88 0.88 0.88 0.88

*) The values given apply for sizes of 4 mm, 0.16 in diameter for the KANTHAL alloys and of 1 mm, 0.04 in for the NIKROTHAL alloys.